tert-butyl N-{[(3S)-6-methyl-4-[(4-nitrobenzene)sulfonyl]-3,4-dihydro-2H-1,4-oxazin-3-yl]methyl}carbamate

benzyl N-[(2S)-3-[(tert-butyldimethylsilyl)oxy]-2-[N-(prop-2'-yn-1'-yl)(4-nitrobenzene)sulfonamido]propyl]carbamate

benzyl (3S)-3-{[(tert-butyldimethylsilyl)oxy]methyl}-6-methyl-4-[(4-nitrobenzene)sulfonyl]-1,2,3,4-tetrahydropyrazine-1-carboxylate